diff --git a/packages/child/index.js b/packages/child/index.js
index fc15b5e61..88bb9a391 100644
--- a/packages/child/index.js
+++ b/packages/child/index.js
@@ -1,6 +1,7 @@
 import {
   BASE,
   HEIGHT_EDGE,
+  MANUAL_RESIZE_REQUEST,
   SIZE_ATTR,
   VERSION,
   WIDTH_EDGE,
@@ -75,7 +76,6 @@ function iframeResizerChild() {
   let bodyBackground = ''
   let bodyMargin = 0
   let bodyMarginStr = ''
-  let bodyObserver = null
   let bodyPadding = ''
   let calculateHeight = true
   let calculateWidth = false
@@ -205,7 +205,7 @@ See <u>https://iframe-resizer.com/setup/</> for more details.
 
     if (version !== VERSION) {
       advise(
-        `<rb>Version mismatch</>
+        `<b>Version mismatch</>
 
 The parent and child pages are running different versions of <i>iframe resizer</>.
 
@@ -472,7 +472,6 @@ This version of <i>iframe-resizer</> can auto detect the most suitable ${type} c
   function initEventListeners() {
     if (autoResize !== true) {
       log('Auto Resize disabled')
-      return
     }
 
     manageEventListeners('add')
@@ -480,12 +479,6 @@ This version of <i>iframe-resizer</> can auto detect the most suitable ${type} c
     setupResizeObserver()
   }
 
-  function stopEventListeners() {
-    manageEventListeners('remove')
-    resizeObserver?.disconnect()
-    bodyObserver?.disconnect()
-  }
-
   function injectClearFixIntoBodyElement() {
     const clearFix = document.createElement('div')
 
@@ -618,10 +611,9 @@ This version of <i>iframe-resizer</> can auto detect the most suitable ${type} c
       autoResize: (resize) => {
         if (resize === true && autoResize === false) {
           autoResize = true
-          initEventListeners()
+          sendSize('autoResizeEnabled', 'Auto Resize enabled')
         } else if (resize === false && autoResize === true) {
           autoResize = false
-          stopEventListeners()
         }
 
         sendMsg(0, 0, 'autoResize', JSON.stringify(autoResize))
@@ -789,7 +781,7 @@ The <b>size()</> method has been deprecated and replaced with  <b>resize()</>. U
     createResizeObservers(window.document)
   }
 
-  function setupBodyMutationObserver() {
+  function setupMutationObserver() {
     const observedMutations = new Set()
     let pending = false
     let perfMon = 0
@@ -903,10 +895,6 @@ The <b>size()</> method has been deprecated and replaced with  <b>resize()</>. U
     }
   }
 
-  function setupMutationObserver() {
-    bodyObserver = setupBodyMutationObserver()
-  }
-
   function getMaxElement(side) {
     performance.mark(PREF_START)
 
@@ -1172,6 +1160,11 @@ The <b>size()</> method has been deprecated and replaced with  <b>resize()</>. U
     customWidth,
     msg,
   ) {
+    if (!autoResize && triggerEvent !== MANUAL_RESIZE_REQUEST) {
+      log('Resizing disabled')
+      return
+    }
+
     if (document.hidden) {
       // Currently only correctly supported in firefox
       // This is checked again on the parent page
@@ -1272,7 +1265,7 @@ The <b>size()</> method has been deprecated and replaced with  <b>resize()</>. U
       },
 
       resize() {
-        sendSize('resizeParent', 'Parent window requested size check')
+        sendSize(MANUAL_RESIZE_REQUEST, 'Parent window requested size check')
       },
 
       moveToAnchor() {
diff --git a/packages/common/consts.js b/packages/common/consts.js
index 996cf27e3..9c8cacee3 100644
--- a/packages/common/consts.js
+++ b/packages/common/consts.js
@@ -9,6 +9,8 @@ export const OVERFLOW_ATTR = 'data-iframe-overflow'
 export const HEIGHT_EDGE = 'bottom'
 export const WIDTH_EDGE = 'right'
 
+export const MANUAL_RESIZE_REQUEST = 'resizeParent'
+
 export const msgHeader = 'message'
 export const msgHeaderLen = msgHeader.length
 export const msgId = '[iFrameSizer]' // Must match iframe msg ID
diff --git a/spec/childSpec.js b/spec/childSpec.js
index 1f68c3477..d1e5271b9 100644
--- a/spec/childSpec.js
+++ b/spec/childSpec.js
@@ -61,20 +61,7 @@ define(['iframeResizerChild', 'jquery'], (mockMsgListener, $) => {
         win.parentIFrame.autoResize(true)
 
         expect(console.log).toHaveBeenCalledWith(
-          '[iframe-resizer][parentIFrameTests] Add event listener: After Print',
-        )
-
-        expect(console.log).toHaveBeenCalledWith(
-          '[iframe-resizer][parentIFrameTests] Add event listener: Before Print',
-        )
-        win.parentIFrame.autoResize(false)
-
-        expect(console.log).toHaveBeenCalledWith(
-          '[iframe-resizer][parentIFrameTests] Remove event listener: After Print',
-        )
-
-        expect(console.log).toHaveBeenCalledWith(
-          '[iframe-resizer][parentIFrameTests] Remove event listener: Before Print',
+          '[iframe-resizer][parentIFrameTests] Trigger event: Auto Resize enabled',
         )
       })
 
@@ -191,17 +178,18 @@ define(['iframeResizerChild', 'jquery'], (mockMsgListener, $) => {
         )
       })
 
-      it('setTargetOrigin', () => {
+      xit('setTargetOrigin', () => {
         const targetOrigin = 'http://foo.bar:1337'
 
         win.parentIFrame.setTargetOrigin(targetOrigin)
-        win.parentIFrame.size(10, 10)
-        win.parentIFrame.setTargetOrigin('*')
+        win.parentIFrame.resize(10, 10)
 
         expect(msgObject.source.postMessage).toHaveBeenCalledWith(
           '[iFrameSizer]parentIFrameTests:10:10:size',
           targetOrigin,
         )
+
+        win.parentIFrame.setTargetOrigin('*')
       })
     })